Time damper mechanism.



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PATENTE) SEPT. ze', 1905.

` M. C. HARPERlv TIME DAMPER MEGHANISM.

APPLIOTION FILED .AIPIB.18, 1904.

2 SHEETS-SHEET. 2.

Ci CEU/en www ?" '/fmc@ f j UNrTRD smilies-PATENT oRRroR. MALCOLM c. HARPER, EvANsToN, ILLINOIS.

TIN-IE DAIVIPEI! NIECHANISNI.-

To al?, tlf/tom t may concern,.-

embracing a clock mechanism like an ordinary alarm-clock and anv actuating-weight, which is released bythe clock and the movement of i which when released effects the opening or closing ofthe damper or dampers.

rlhe invention consists in the matters hereinafter described, and pointed out in the appended claims. I v In the accompanying drawings, Figure 1 is a View in side elevation of a furnace, together witha damper-actuating mechanism embodying my invention. Fig. 2 is an enlarged detail section of the casing which contains the clock, taken on line 2 2 oi' Fig. 3,v the clock and actuating-weight, with associated parts, being. shown in side elevation. Fig. 3 is a plan section of Ythe same parts shown in Fig. 2, taken upon line 3, 3 of Fig. 2. Fig. 4 isa vertical section taken upon line4 4 ot' Fig. 2. Fig. 5 is a detail vertical section taken upon line ,5 5 of Fig. 4. Fig. 6 is a perspective View showing the rear face of. the clock, the weight, and the detent-lever which holds the weight from movement and is acted upon by the clock. Fig. 7 is a view showing a somewhat diiferent arrangement in the devices for communicating motion from the actuatingweight oi" the device to the furnace. and 9 are side and face views, respectively, of the detent-lever and upper part of the weightarm, showing a modified construction in these parts.

As shown in said drawings, A indicates a clock of the kind commonly called an alarm-clock. Said clock need not have anyl alarm-bell attached, as the only part of the alarm mechanism used in the present instance is the spring-actuated mechanism which is commonly usedt'o operate the alarm-bell ham-v mer. As shown `inthe said drawings, A is the winding-shaft of the spring-actuated mechlS]g ecicaton of Letters Patent. Application filed April 18,l 1904. Serial No. 203,717.

Figs. 8-

racentea sept. 26, 1905.

anism, which is provided with a windingcrank ct.

B -designates a weight-supporting arm arranged generally in an upright position and pivotedA at its lower end on a horizontal pivot pin or rod To the upper end of said arm B is attached a weight B.

C designates a detent-lever vwhich is pivoted Vbetween its ends to swing on a horizontal pivot c. Said detent-lever is provided at its end adjacent to the weight-arm B with a holding prong or tooth 0', adapted for engagement with a shoulder b' on the said arm, the detent-lever being so arranged that when its end which engages the lever B is at the upward vlimit of'its movement it engages the said shoulder and thereby holds the weight-arm in its upright position and the weight from falling, and when said end is depressed it will release the arm and weight to permit the descent of the weight through the swinging of the arm on its pivot. The parts areso arranged thatwhen the weight-arm is engaged by the detent-lever G said arm will be slightly `inclined from the vertical, with the center.

of gravity of the weight at the side of the but, as herein illustrated, the detent-lever isv provided withva longitudinal slot 02, and the crank-arm a on the winding-shaft A is pro. vided with a part a', which is 'parallel with the shaftitself and passes through said slot c2. As a result of this construction when the winding-shaft is released through the action of the clock mechanism and permitted to turn `the detent-lever will be 'moved oroscillated, so as to release its opposite endpfrom the lever B and permit the descent of theweight. In addition to the parts described I also employ a spring-detent D, which is varranged in position to engage a projection or shoulder b2 of the lever B when the said lever is swung .past the position in whichit Vengages the detent-lever, and thereby holds the weight from I falling when it is desired that the weight shall be held or locked from movement. ln the particular construction shown the shoulder L for engaging' the detent-lever G and the shoulder b2 for engaging the spring-holding detent D are `formed on the weight at either side of the outer end of the arm B, the weight and arm being for convenience cast in one piece; but said shoulders may be formed either on the weight or on the arm, as preferred, the effect being the same in either ease.

For communicating motion from the weight to the damper or dampers a chain Eis shown as attached to the weight or its supportingarm, said chain being preferably secured to the arm at a point between the weight and the pivotal point of the arm. Said chain passes upwardly over a guide-pulley F and then horizontally over a second guide-pulley F. In the particular construction shown the parts above described are mounted in a rectangular frame consisting of three uprights G G G2, a top horizontal frame-piece G3, and a bottom horizontal frame-piece G. Side walls G and GG are secured to the framepieces, so as to form a case or inclosure for the parts. The clock A is inclosed in a compartment formed by means of the two upright frame-pieces G G' and two horizontal pieces g g, which form the bottom and top walls of the inclosure or compartment and of which the piece g forms a shelf on which the clock rests. The compartment for the clock thus formed is provided with a hinged door G7, which forms part of the wall urfand covers the side of the compartment at which the winding-shaft projects, but which is wide enough to extend past the upright piece G and expose the end ot' the detent-lever C, which engages the weight B. The clock A is shown as fitted in a hole made in the wall G5, so that the face of the clock will be visible from the exterior of the inclosure, while at the same time the rear part of the clock and parts there located will be within the inclosure and will be protected from dust and dirt. Said detent-lever C is shown as passing through a hole in the upright G and the pivot c for the lever as being inserted in the said upright. The pivot b for the lower end of the lever is shown as made of staple form and secured to the lower horizontal framepiece G4. The spring-detent D is shown as attached to the side of the frame-piece G.

As shown in Fig. 1, H is a furnace of or-l dinary construction having a draft-door H', which is hinged so as to swing on hinges at its upper edge, and a smoke-pipe H2, provided with a damper 1 and a check-draft J.

The damper 1 is shown as pivoted on a horizontal shaft e', provided with a counterbalance-weight e" on anarm which extends upwardly from the shaft z' and swings over said shaft when the damper is turned from its open to its closed position, or vice versa, and thereby tends to hold the saine either in its open or closed position. Said shalt also hasa depending arm i, by which the damper is aetuated. The check-draft .l is shown as consisting' ot' a plate which is pivoted at its upper margin to the smoke-pipe and in connection with which is employed a bell-crank lever K, pivoted to the side oli the pipe and having an arm f, which is adapted to engage one otl a series of teeth j on the damper and serves as a prop to hold the same open. Said bell-crank lever also has an arm through which the lever is actuated. ln this instance the chain E after passing over the guidepulley F' passes downwardly over a pulley F2 and then horizontally to the sniolm-pipe H2, where it is connected with thc damperlever 2 and the arm 1 of the bell-crank lever J. ln this instance, moreover, a chain L is secured at its lower end to a draft-door H and at its upper end to the ceiling, and said chain L is connected with the chain lC at the point where the lattercrosses the same.

In the operation oi this device it is manifest that when the weight B is released and falls from its vertical to its horizontal position tension will be exerted on the chain ll), which will result in flexing the chain L, so as to lift or open the draft-door ll. 'l`he pull on the chain E will also turn the damper l to open the same and swing the bell-crank lever K so as to release the check-draft rl.

1n Fig. 7 l have shown a somewhat dili'erent arrangement ot' the parts for operating the cheekdraft. .ln this instance the checkdamper is located on one side of the smokepipe H2 and a lever M employed which is hung between its ends` on a chain N, which forms a fulcrum for the lever and is attached at its upper end to the ceiling'. Said lever i\l isarranged with one end over the lfree edge of the check-damper, with which it is connected by a chain or flexible connection, while its opposite end is provided with a weight M. An actuating-chain O in this instance is eonnected with the weight M and extends upwardly and is attached to a stationary object P. A chain Q extends above the same horizontally from the chain O to the chain lt, said chain Q being connected with the chain between the ends of the latter. 'lhe weight M is made sutliciently heavy to lilt the cheekdauiper and to hold the samenormallyopened; but when the actuatiiig-weight B is released and falls the weight M is lil'ted by the action of the'chain O and the check-damper thereby permitted to close. This latter construction is a convenient one for use in applying the device to old furnaces inasmuch as it enables the operating-lever to be easily placed or supported in any desired position necessary lor operation whatever may be the location ol the check-draft damper with respect to the operating device.

ICJ

llO

An important advantage is gained byplac# ing the actuating-weight on an arm so arranged that the said arm stands in a nearly vertical position when the weight isl lifted and held by the holding-detent C, for the reason that in this position of the weight-arm the weight exerts very little pressure on the holding-detent` and the latter may therefore be moved with very slight exertion of force or power by the clock mechanism. It follows that the weight may be very readily released; but after its release it acts with increasing force as it descends, reaching its maximum eiect when nearly in a horizontal position, so that'a weightof relatively small size will exert sufficient power to easily operate all the dampers of va furnace.

- Moreover, by attaching the actuating-chain tothe weight-arm at a point between the weight r andthe pivot of the arm the effectiveness of the weight is increased, andY by changing the point of attachment of the chain to the arm any desired amount of power may be obtainedr within the limits afforded by the gravity of the weight and the length of Athe arm in accordance with the necessity of any particular case, it being obvious that when the chain is attached to. the arm at a point near the pivot the movement given will loe less and the power will be greater, while if a greater movement and less power be required the chain may be attached near the extremity of the arm or even to the weight itself.

' Figs. 8 and 9 show a construction which maybe substituted for the spring catch or detent D above described for holding the weight out of action. As shown in said figures, R indicates a horizontally-arranged latch-lever,

which is pivoted to the outer face of the weight-arm B andy projects from the side face of said arm in position to engage the detentlever C. .Said latch-lever R is adapted to swing between lower and upper stop-lugs 1' 1" on the i arm B and to rest normally on the lower stoplug fr. The detent-lever C is provided in this instance in addition to the holding-tooth c with a second holding-tooth S, located at the rear of `said tooth c'. When in the use Vof this device the weight-arm B is swung to its uppermost position, the latch-lever R will engage the tooth S, whichl will hold the weight? arm from movement; but said tooth S being longer or higher than the tooth c' it will not be released from the latch-lever R if the detent-lever C be moved by the clock, so that the weight-arm'will loev positively held from movement by saidA parts. When, however, the parts are to "be set foraoperation by the clock, the latch-leverRwill be lifted over the longer tooth S and engaged with the tooth c', and then upon .the actuation of the detent-lever by the clock the weight-arm will be released, as in the construction first described.

An importantadvantage of the construction shown in Figs. 8. and 9 is that'in case the crank,- arm of the winding-shaft should come to rest insa position to hold the' detent-lever C with its end which engages the'weigh't-arm elevated then in the construction shown in the other figures the shoulder b2 on said arm could not pass over the toothv c andthe weight-arm could not be thrown into position to belocked out of action. When va pivoted latch R is used, the free end of said latch will under the conditions referred to rise or ride over the said tooth c" and permit the arm to be swung upwardly or' backwardlvfar enough to engage the ltooth S. It follows from the above that the pivoted latch R will be useful whether the weight is held or lockedby the spring-detent D or by the auxiliary tooth Son the detent-lever.

I claim as my'invention- 1. A draft-controlling device embracing a clock mechanism, a pivotally-supported arm provided with a weight, a detent-lever adapted to engage said arm when the weight stands nearly over the pivotal axis of the arm and' which is operated the clock mechanism, a damper-operating chain connected with said arm between the weight and the pivot of the arm and a guide-pulley for the chain located above the level of the pivot of the arm.

' 2.v A draft-controlling device embracing a clock mechanism, a pivotally-supported arm provided with a weight, a detent-lever operated by the Aclock mechanism adapted to engage the arm when the weight isnearly overv the pivotal axis of the arm, a damper-operating chain connected with said arm between the weight and the'pivo't of the arm and av point at whir it is engaged and held by the lirst-named shoulder` of the detent-lever, and a damper-operating chain connectedwith said arm.

4. The combination with a gravity-closing damper, of a controlling device embracing a clock mechanism, an arm provided with a weight,`a detent-lever operated by the clock mechanism adapted to vsupport the weight in a position nearly over theA pivotal axis of the arm, an upright chain connected at its lower end with the damper and at its upper end with a stationary object, and a chain connected with thesaid arm and which is connected with and leads laterally from the upright chain between the ends of the latter.

IOO

IIS

. Zontally-arranged lever which is pivoted between its ends, is connected at one end with the check-damper and provided at its oppo- -site end with a weight which tends, by its gravity, to lift said damper to open the same, and a chain 'connected with said rising-andfalling Weight and with the weighted end ot' the horizontal lever and operating to lift said weighted end of the horizontal lever when the rising-and-falling weight descends.

6. A draft-controlling device embracing a clock mechanism, a pivotally supported Weighted arm, an arm provided with a weight Which is adapted to rise and fall through the swinging of the arm on its pivot and when, in its elevated position, stands nearly over the pivot of said arm, a detent-lever operated by the clock mechanism and a gravity-actuated pivoted latch-lever on the weighted arm adapted for engagement with said detentlever.

7. A draft-controlling device en'lbracing a clock mechanism, a pivotally supported, weighted arm adapted to swing from a horizontal into a nearly upright position, a detent-lever having a tooth adapted to engage said arm when in its nearly upright position and which is connected with and operated by the clock mechanisms, and a second tooth on the detent-lever and a pivoted latch-lever on the weighted arm adapted for engagement when said arm is raised and thrown rearwardly past the position in which it is engaged by the lirst-named tooth on said detent-lever.

In testimony that I claim the foregoing as my invention I ax my signatnre,in presence of two witnesses,this 15th day of April, A. D.

MALCOLM C. HARPER. Titnessesz C. CLARENCE PooLn, GERTRUDE BRYCE. 

